Incandescent lamp.



No. 656,l|5. Patented Aug. l4, I900.

C. HOELSCHER.

INCANDESCENT LAMP.

(Application filed Apr/30, 1900.)

(No Model.)

UNITED STATES CHRISTIAN HOELSCHER, OF WARREN, OI-IIO.

INCANDES CiENT LAMP.

SPECIFICATION forming part of Letters Patent No. 656,115, dated August14, 1900.

Application filed April 30, 1900. Serial No. 14,953. (No model.)

To a whom it may concern.-

Be it known that I, CHRISTIAN HOELSOHER, of Warren, in the county ofTrumbull and State of Ohio,have invented certain new and usefulImprovements in Incandescent Lamps; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

This invention contemplates certain new and useful improvements inincandescent electric lamps. Ithas reference to that class of lampsemploying a plurality of filaments and means for so controlling thecurrent that it may be cut into either filament alone or both in seriesand multiple, according as it is desired to have a dim or bright light.

The improvement in the present case is especially applicable to theWVestinghouse socket, the alterations in the construction of which donot prevent the use of the regular type of lamp applicable thereto.

The objects of the present invention are to provide extremely simplemeans for regulating the light to be given forth bythe lamp and also topermit of the use of the ordinary lamp in connection with the socket.The invention will be hereinafter fully set forth, and particularlypointed out in the claims.

In the accompanying drawings, Figure 1 is a-vertical sectional viewtaken through the lamp and socket, which are shown slightly separated.Fig. 2 is face view of the base. Fig. 3 is a lower face view of'thesocket.

Referring to the drawings, A designates an incandescent-lamp bulb havingthree leading-in wires a b c, which are connected to the two sets offilaments, numbered 1 and 2. The leading-in wire a leads from a post 3,projecting from the axial center of base 4-, while wires 1) and 0 lead,respectively, from contactplates 5 and 6, set in said base.

B is a socket of the Westinghouse type, having in a partition b acentral opening in which is fitted a spring contact-plate 7 toaccommodate and hold the post 3. In electrical connection with thiscentral contact-plate is a plunger 8, located in partition 1) near thewith the altered socket.

central opening. This plunger is of the spring and telescopic sleevepattern. With this plunger the post 10 of current-wire 12 is connected.The other current-wire 13 leads to a post 14, which is connected withthe springcontact tongue 15 on the lower or exposed face of partitionI). The addition of the plunger constitutes the sole change in theconstruction of the lamp-socket; but this does not in any way precludethe use of the regular type of WVestinghouse lamp in connection The lampis, as customary, held in position by spring-fingers 16 of the socketconnecting an annular ridge 17 of the lamp-bulb.

Itwill be noticed that the contact-plates 5 and 6 are of such length andconformation along their inner opposite edges, being cut out at 18, thatchanges in contacts between plates 5 and 6, with plunger 8 and tongue15, may be had by turning the lamp axially in its socket. filaments maybe controlled as follows: To dimly light the two filaments, the lamp isturned to place plate 5 of the base in contact with tongue 15 of thesocket. To light filament 2 alone, plate 6 of the base is brought intocontact with tongue 15. To light filament No. 1 alone, plate 5 isbrought into contact with tongue 15, while plate 6 is placed in engage-In this way the current to the ment with plunger 8, while to light bothfilaments to the maximum capacity the lamp is axially turned to placeplate 6 in contact with tongue 15 and plate 5 with plunger 8.

Thus it will be seen that without the addition of any separate partbetween the lamp and socket the current to either or both filaments maybe controlled by simply turning the lamp axially. It will be understoodthat post 3 always remains in contact with plate 7 while the lamp is inthe socket, thus completing one terminal, the other of which iscontrolled by the positions of the contact-plates of the base. Therelative arrangement of the contact-plates is such that but one of themmaybe in electrical engagement with the contacts of the terminals orboth may be, according to the light it is sought to obtain from thelamp. In other Words, by providing the socket with a main terminal andtwo auxiliary terminals and the base with a contact for engaging saidmain terminal and two contact-plates for engaging either or both theauxiliary terminals current to the filaments may be controlled byturning the lamp axially.

I claim as my invention- 1. The combination with a socket having a mainterminal and two auxiliary terminals, of a lamp having a plurality offilaments therein, a central contact for constantly engaging said mainterminal, and two other contacts for engaging either or both of saidauxiliary terminals when the lamp is turned axially, said filamentsbeing connected to said contacts of the lamp.

2. The combination with a socket having a main terminal andtwo auxilaryterminals, of a lamp having a plurality of filaments therein, a postprojecting centrally from the base of the lamp for constantly contactingwith said main terminal, and two other contacts for engaging either orboth of said auxiliary terminals when the lamp is turned axially, saidfilaments being connected to said post and contacts of the lamp.

The combination with a socket having a main terminal and two auxiliaryspring-actuated terminals, of a lamp havinga plurality of filamentstherein, a central contact for constantly engaging said main terminal,and two other contacts for engaging either or both of saidspring-actuated terminals when the lam p is turned axially, saidfilaments being connected to said contacts of the lamp.

4. The combination with a socket having a main terminal and twoauxiliary spring-actuated terminals, of alamp havinga plurality offilaments therein, a base on said lamp having a contact-post forconstantly contacting with said main terminal, two contactplates in saidbase for engaging either or both of said spring-actuated terminals whenthe lamp is turned axially, said filaments being connected to said postand contact-plates, as set forth.

5. The combination with a socket having a central terminal-plate, aplunger in electrical connection therewith, and a spring-terminal, of alamphaving a plurality of filaments, a base, a post projecting centrallytherefrom for constantly engaging said central terminal plate of thesocket, and two contact-plates in said base for engaging either theplunger or spring-terminal, or both, when the lamp is turned axially,said filaments being connected to said post and contact-plates,substantially as set forth.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

CHRISTIAN HOELSCIIER.

Vitnesses:

FRANK S. CHRYST, ELMER O. DILLEY.

